I am opening a file in collabora online but can not read the content

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Hi, I am opening a file in collabora but can open and write in collbora. collabora is changing my content in json. this is my code

function parseWopiRequest($uri) {
       $path = parse_url($uri, PHP_URL_PATH);
       preg_match('~^/wopi.php/files/([[:alnum:]_-]+)~', $path, $matches);
        $numMatches = count($matches);
        $fileId = $matches[1]; // Extract the file ID from the URL
        $file_root = $_GET['root_folder']; //'templates/2024-03';
        $file_ext = $_GET['file_ext']; //'docx';
        $can_edit = $_GET['can_edit']; //1;
        $DOCUMENT_ROOT = '/var/www/html/demo/media/'.$file_root.'/';

        $token = generateAccessToken($fileId);
        error_log('INFO: access token: ' . $token);

        if($numMatches >= 1){

            switch ($_SERVER['REQUEST_METHOD']) {
                case  'GET': wopiGetFile($DOCUMENT_ROOT,$matches[1],$file_ext,$can_edit); break;
                case 'POST': wopiPutFile($DOCUMENT_ROOT,$matches[1],$file_ext,$can_edit); break;
            }
        }
        elseif($numMatches == 2){
            wopiCheckFileInfo($DOCUMENT_ROOT,$matches[1],$file_ext,$can_edit);
        }
    }

    /**
     *  Parses the URL in order to extract from the query section the access token value.
     */
    function getAccessToken($uri) {
        $query = parse_url($uri, PHP_URL_QUERY);
        if ($query) {
            $params = explode('&', $query);
            foreach ($params as $param) {
                $pair = explode('=', $param);
                if ($pair && count($pair) == 2) {
                    if ($pair[0] == 'access_token') {
                        return $pair[1];
                    }
                }
            }
        }
        return '';
    }
    function wopiCheckFileInfo($DOCUMENT_ROOT,$documentId,$file_ext,$edit) {
        
        $filePath = $DOCUMENT_ROOT . basename($documentId.'.'.$file_ext); // Basic sanitation

        // echo $filePath;
        // die();
        if (file_exists($filePath)) {
            $response = [
                'BaseFileName' => basename($filePath),
                'Size' => filesize($filePath),
                'OwnerId' => 'haider@legai.tech',
                'Version' => '1',
                'UserCanWrite' => $edit
            ];
            header('Content-Type: application/json');
            echo json_encode($response);
        }
    }

    function wopiGetFile($DOCUMENT_ROOT,$documentId,$file_ext,$edit) {

        $filePath = $DOCUMENT_ROOT . basename($documentId.'.'.$file_ext); // Basic sanitation

        if (file_exists($filePath)) {
            $response = [
                'BaseFileName' => basename($filePath),
                'Size' => filesize($filePath),
                'OwnerId' => 'haider@legai.tech',
                'Version' => '1',
                'UserCanWrite' => $edit
            ];
            header('Content-Type: application/json');
            echo json_encode($response);
        }
    }

    function wopiPutFile($DOCUMENT_ROOT,$documentId,$file_ext,$edit) {
        error_log('INFO: wopiPutFile invoked: document id: ' . $documentId);
        $filePath = $DOCUMENT_ROOT . basename($documentId.'.'.$file_ext); // Basic sanitation
        $fh = fopen('php://input', 'r');
        $fileContent = '';
        while ($line = fgets($fh)) {
            $fileContent = $fileContent . $line;
        }
        fclose($fh);
        updateFileContent($filePath, $fileContent);
        // you can check the new file content on the apache error log file
        error_log('INFO: ' . $fileContent);
    }
    function updateFileContent($filePath, $newContent) {
        // Use file_put_contents to replace the content of the file
        // The LOCK_EX flag is used to acquire an exclusive lock on the file during writing
        if (file_put_contents($filePath, $newContent, LOCK_EX) !== false) {
            echo "File content updated successfully.";
        } else {
            echo "Error updating file content.";
        }
    }

    $requestUri = $_SERVER['REQUEST_URI'];
    parseWopiRequest($requestUri);